「小程序JAVA实战」小程序的留言和评价功能(69)

目前小程序这块就只差留言功能了,从这次开始将对留言这个模块进行讲解和开发。源码:https://github.com/limingios/wxProgram.git 中No.15和springboot

后台开发

后台需要通过代码生成器针对留言表生成对应的pojo,mapper,mapper.xml,controller增加2个方法,一个添加留言,一个查看留言列表(分页显示)

  • controoller
    > fatherCommentId 和 toUserId 主要针对的是评论功能,这里是把留言和评论设计在一张表里了

    @PostMapping("/saveComment")
    public JSONResult saveComment(@RequestBody Comments comment,
                                       String fatherCommentId, String toUserId) throws Exception {

        comment.setFatherCommentId(fatherCommentId);
        comment.setToUserId(toUserId);

        videosService.saveComment(comment);
        return JSONResult.ok();
    }

    @PostMapping("/getVideoComments")
    public JSONResult getVideoComments(String videoId, Integer page, Integer pageSize) throws Exception {

        if (StringUtils.isBlank(videoId)) {
            return JSONResult.ok();
        }

        // 分页查询视频列表,时间顺序倒序排序
        if (page == null) {
            page = 1;
        }

        if (pageSize == null) {
            pageSize = 10;
        }

        PagedResult list = videosService.getAllComments(videoId, page, pageSize);

        return JSONResult.ok(list);
    }

  • service中添加2个方法
    >同controller,获取所有的留言列表功能,一个添加留言评价
@Transactional(propagation = Propagation.REQUIRED)
    @Override
    public void saveComment(Comments comment) {
        String id = sid.nextShort();
        comment.setId(id);
        comment.setCreateTime(new Date());
        commentMapper.insert(comment);
    }

    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public PagedResult getAllComments(String videoId, Integer page, Integer pageSize) {

        PageHelper.startPage(page, pageSize);

        List<CommentsVO> list = commentMapperCustom.queryComments(videoId);

        for (CommentsVO c : list) {
            String timeAgo = TimeAgoUtils.format(c.getCreateTime());
            c.setTimeAgoStr(timeAgo);
        }

        PageInfo<CommentsVO> pageList = new PageInfo<>(list);

        PagedResult grid = new PagedResult();
        grid.setTotal(pageList.getPages());
        grid.setRows(list);
        grid.setPage(page);
        grid.setRecords(pageList.getTotal());

        return grid;
    }

  • Vo类,方便页面展示评论人的信息,也方便mybatis查询的内容直接赋值
package com.idig8.pojo.vo;

import java.util.Date;
import javax.persistence.*;

import org.springframework.format.annotation.DateTimeFormat;

public class CommentsVO {
    private String id;

    /**
     * 视频id
     */
    private String videoId;

    /**
     * 留言者,评论的用户id
     */
    private String fromUserId;

    private Date createTime;

    /**
     * 评论内容
     */
    private String comment;

    private String faceImage;
    private String nickname;
    private String toNickname;
    private String timeAgoStr;


    public String getTimeAgoStr() {
        return timeAgoStr;
    }

    public void setTimeAgoStr(String timeAgoStr) {
        this.timeAgoStr = timeAgoStr;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getFaceImage() {
        return faceImage;
    }

    public void setFaceImage(String faceImage) {
        this.faceImage = faceImage;
    }

    /**
     * @return id
     */
    public String getId() {
        return id;
    }

    /**
     * @param id
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * 获取视频id
     *
     * @return video_id - 视频id
     */
    public String getVideoId() {
        return videoId;
    }

    /**
     * 设置视频id
     *
     * @param videoId 视频id
     */
    public void setVideoId(String videoId) {
        this.videoId = videoId;
    }

    /**
     * 获取留言者,评论的用户id
     *
     * @return from_user_id - 留言者,评论的用户id
     */
    public String getFromUserId() {
        return fromUserId;
    }

    /**
     * 设置留言者,评论的用户id
     *
     * @param fromUserId 留言者,评论的用户id
     */
    public void setFromUserId(String fromUserId) {
        this.fromUserId = fromUserId;
    }

    /**
     * @return create_time
     */
    public Date getCreateTime() {
        return createTime;
    }

    /**
     * @param createTime
     */
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    /**
     * 获取评论内容
     *
     * @return comment - 评论内容
     */
    public String getComment() {
        return comment;
    }

    /**
     * 设置评论内容
     *
     * @param comment 评论内容
     */
    public void setComment(String comment) {
        this.comment = comment;
    }

    public String getToNickname() {
        return toNickname;
    }

    public void setToNickname(String toNickname) {
        this.toNickname = toNickname;
    }
}

  • CommentsMapperCustom mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.idig8.mapper.CommentsMapperCustom" >
  <resultMap id="BaseResultMap" type="com.idig8.pojo.vo.CommentsVO" >
    <!--
      WARNING - @mbg.generated
    -->
    <id column="id" property="id" jdbcType="VARCHAR" />
    <result column="video_id" property="videoId" jdbcType="VARCHAR" />
    <result column="from_user_id" property="fromUserId" jdbcType="VARCHAR" />
    <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
    <result column="comment" property="comment" jdbcType="LONGVARCHAR" />
    <result column="face_image" property="faceImage" jdbcType="VARCHAR" />
    <result column="nickname" property="nickname" jdbcType="VARCHAR" />
    <result column="toNickname" property="toNickname" jdbcType="VARCHAR" />
  </resultMap>

  <select id="queryComments" resultMap="BaseResultMap" parameterType="String">
    select c.*,u.face_image as face_image,u.nickname,tu.nickname as toNickname 
    from comments c 
    left join users u on c.from_user_id = u.id
    left join users tu on c.to_user_id = tu.id
    where c.video_id = #{videoId} order by c.create_time desc
  </select>

</mapper>
  • mapper类 添加方法,方便调用
package com.idig8.mapper;

import java.util.List;

import com.idig8.pojo.Comments;
import com.idig8.pojo.vo.CommentsVO;
import com.idig8.utils.MyMapper;

public interface CommentsMapperCustom extends MyMapper<Comments> {

    public List<CommentsVO> queryComments(String videoId);
}

前台功能

videoInfo.wxml

<view class="saySthView">
<input name="commentContent" class="saySth" placeholder="{{placeholder}}" confirm-type="send" bindconfirm="saveComment" focus='{{commentFocus}}' value='{{contentValue}}'
data-replyFatherCommentId='{{replyFatherCommentId}}'
data-replyToUserId='{{replyToUserId}}'
/>
</view>

<block wx:for="{{commentsList}}">
  <view class='comments-all' bindtap='replyFocus' 
  data-fatherCommentId='{{item.id}}'  
  data-toUserId='{{item.fromUserId}}' 
  data-toNickname='{{item.nickname}}' 
  >
      <view class='container-comments'>
          <image class="face-comments" src='{{serverUrl}}{{item.faceImage}}' ></image>
          <view class='nickname-comments'>
              <label class='nickname-lbl'>@{{item.nickname}}</label>
              于 
              <label class='date-lbl'>{{item.timeAgoStr}}</label>
              <!-- 留言: -->
              <block wx:if="{{item.toNickname != null}}">
                回复
                <label class='nickname-lbl'>@{{item.toNickname}}</label>
              </block>
              <block wx:else>
                留言:
              </block>
          </view>
      </view>
      <view class='comments-content'>{{item.comment}}</view>
  </view>
</block> 

</view>

  • videoInfo.js

leaveComment: function () { this.setData({ commentFocus: true }); }, replyFocus: function (e) { var fatherCommentId = e.currentTarget.dataset.fathercommentid; var toUserId = e.currentTarget.dataset.touserid; var toNickname = e.currentTarget.dataset.tonickname; this.setData({ placeholder: "回复 " + toNickname, replyFatherCommentId: fatherCommentId, replyToUserId: toUserId, commentFocus: true }); }, saveComment: function (e) { var me = this; var content = e.detail.value; // 获取评论回复的fatherCommentId和toUserId var fatherCommentId = e.currentTarget.dataset.replyfathercommentid; var toUserId = e.currentTarget.dataset.replytouserid; var user = app.getGlobalUserInfo(); var videoInfo = JSON.stringify(me.data.videoInfo); var realUrl = '../videoinfo/videoinfo#videoInfo@' + videoInfo; if (user == null || user == undefined || user == '') { wx.navigateTo({ url: '../userLogin/login?redirectUrl=' + realUrl, }) } else { wx.showLoading({ title: '请稍后...', }) wx.request({ url: app.serverUrl + '/video/saveComment?fatherCommentId=' + fatherCommentId + "&toUserId=" + toUserId, method: 'POST', header: { 'content-type': 'application/json', // 默认值 'headerUserId': user.id, 'headerUserToken': user.userToken }, data: { fromUserId: user.id, videoId: me.data.videoInfo.id, comment: content }, success: function (res) { console.log(res.data) wx.hideLoading(); me.setData({ contentValue: "", commentsList: [] }); me.getCommentsList(1); } }) } }, // commentsPage: 1, // commentsTotalPage: 1, // commentsList: [] getCommentsList: function (page) { var me = this; var videoId = me.data.videoInfo.id; wx.request({ url: app.serverUrl + '/video/getVideoComments?videoId=' + videoId + "&page=" + page + "&pageSize=5", method: "POST", success: function (res) { console.log(res.data); var commentsList = res.data.data.rows; var newCommentsList = me.data.commentsList; me.setData({ commentsList: newCommentsList.concat(commentsList), commentsPage: page, commentsTotalPage: res.data.data.total }); } }) }, onReachBottom: function () { var me = this; var currentPage = me.data.commentsPage; var totalPage = me.data.commentsTotalPage; if (currentPage === totalPage) { return; } var page = currentPage + 1; me.getCommentsList(page); }
  1. 为了方便点击某条留言,进行评论,需要设置(data-名称)
  2. js获取(data-名称)的值是通过,e.currentTarget.dataset.名称
  3. 赋值给评论列表里面的操作(data-名称)就可以了。
  4. 按照顺序看下面的图

image.png

PS:其实都是基本操作,但是有个传值页面属性data绑定必须详细说下,这个很重要。

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